I'm on the road today, and don't have a hole shot handy, but I can assure you that the center tube on the M1-110 does go all the way to the top of the element. Ever since I stumbled on this "deficiency" in the Purolator, I've checked every filter I've used, and I look at any that I'm considering using. So far, the Purolator is the only one I've seen this way. Again, to be perfectly clear, I have no evidence that the short tube is a danger, but my gut feeling is that full oil pressure exerted against the unsupported segment of the element could be a problem, especially in high pressure differential conditions (like a cold start or perhaps rpm surge).
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